I've been seeing a lot of Ts lately, see reference list at the bottom of this blog entry.
In Hebrew, the letter "T" is "Tav." It is the last letter of the alphabet. In the Talmud, Tav is defined as Truth, since truth is found at the end of a journey.
Tav is the mark in Ezekiel's vision. Ezekiel 9:4 reads angels inscribe a blood mark of the letter Tav (תָּ֜ו) on the foreheads of those that grieve over the abominations committed in Jerusalem. And, those without the mark were slaughtered.
So, Tav is the seal of YHVH.
Later in Ezekiel chapter 10, the book describes what some might consider extra terrestrials (cherubim or angels) and UFOs (whirling wheels).
In Revelation chapter 7, God angels seal 144,000 Israelites, protecting them from the judgments of the End Times.
(1) Tamara's T graffiti (from Caprica)
(2) Tara's T tattoo (from United States of Tara)
(3) Transformers & (4) Toyota Prius & (5) Tiger (more info)